Heater blowing cold air

Air mix control motor is located behind right side of dash. Switch between hot and cold and check if moving the door.

Let try and get some codes from it, and let me know what you have for codes.

Turn the ignition switch on while pressing the A/C control auto switch and right front switch simultaneously.
Check that the indicators light up and go off at second intervals four times in succession.
After the indicator check is completed, the system enters the DTC begins automatically.
Press the off switch when desiring to cancel the check mode.
DTC check (sensor check)
Perform an indicator check. After the indicator check is completed, the system enters the DTC check mode automatically.
Read the code displayed on the panel.
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If the slower display is desired, press the front defrost switch and change it to stepped operation. Each time the front defrost switch is pressed, the display changes by 1 step.
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Clearing DTC:
To clear diagnostic trouble code, there are two ways.
During sensor check, press the "defrost switch" switch and "rear switch" switch at the same time.
Pull the ECU-B fuse in engine room J/B for twenty seconds or longer to clear the DTC memory.

Actuator check:
After entering the DTC check mode (sensor check mode) press the right frong switch.
Since each damper, motor and relay automatically operates at 1 sec. intervals beginning in order from ten in the temperature display, check the temperature and air flow visually and by hand.

If the slower display is desired, press the defrost switch and change it to step operation. Each time the defrost switch is pressed, the display

DTC 21: SOLAR SENSOR CIRCUIT
Circuit Description
A photo diode in the solar sensor detects solar radiation and sends signals to the A/C amplifier.

Remove A/C amplifier with connectors still connected.
Turn ignition switch ON.
Measure voltage between terminals S5 and TS of A/C amplifier connector when the solar sensor is subject to an electric light, and when the sensor is covered by a cloth
Voltage:
Sensor subject to electric light: 0.8 - 3.3 V
Sensor is covered by a cloth: Below 0.8 V
HINT:
As the inspection light is moved away from the sensor, the voltage increases.

A: GO TO NEXT STEP.
B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOM TABLE
C: CHECK AND REPLACE HEATER CONTROL HOUSING SUB-ASSEMBLY
INSPECT COOLER (SOLAR SENSOR) THERMISTOR
Remove cooler (solar sensor) thermistor.
Cover sensor with a cloth.
Measure resistance between terminals 1 and 2 of solar sensor connector
Resistance: infinity ohm (No continuity)
HINT:
Connect the positive (+) lead to ohmmeter to terminal 1 and negative (-) lead to terminal 2 of the solar sensor.
Remove the cloth from the cooler (solar sensor) thermistor and subject the sensor to electric light
Measure resistance between terminals 1 and 2 of solar sensor.
Resistance: Approx. 10 kohm (Continuity)
HINT:
Connect the positive (+) lead to ohmmeter to terminal 1 and negative (-) lead to terminal 2 of the solar sensor.
NG: REPLACE COOLER (SOLAR SENSOR) THERMISTOR
OK: GO TO NEXT STEP.
CHECK HARNESS AND CONNECTOR (BETWEEN COOLER (SOLAR SENSOR) THERMISTOR AND HEATER CONTROL HOUSING SUB-ASSEMBLY)
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: GO TO NEXT STEP.
CHECK AND REPLACE HEATER CONTROL HOUSING SUB-ASSEMBLY

Thank you for your donation and using 2carpros. Com and for updating the final fix.
Enjoy and drive safe.

Thank you,
Jack O

Have you checked the heater core for a restriction?ALso does your cooling fan work when its running hot?Are both the upper and lower radiator hose getting too hot to touch?

The running hot the ect would make sense but not the cold heater. If its running hot the heater should be hot unless you loss flow thru the heater core or had a blend door issue.

The blend door is inside the car and and no coolantflows thru it. It just directs the air across the heater core or the evaporator core.

Not sure of the small hoses but would say those would be a heater hose or return hose. Toyotas arent my speciality saturns are. As far as that heat shield there should be bolts holding that on.